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According to ASHRAE standard 34, the R-number of a chemical refrigerant is assigned systematically according to its molecular structure and has between two and four digits. If there are carbon -carbon multiple bonds , there are four digits in all: the number of these bonds is the first digit and the number of carbon atoms minus one (C-1) is next.
R-424A is for use in air conditioning as well as medium-temp refrigeration temperature ranges of 20 to 50˚F. It works with MO, alkylbenzenes (AB), and POE oils. R-427A is for use in air conditioning and refrigeration applications. It does not require all the mineral oil to be removed. It works with MO, AB, and POE oils.
Replacement for R22: Often used as a direct substitute for R22 in many existing systems, facilitating upgrades with minimal system modifications. High Efficiency: Provides effective cooling with good energy efficiency. Environmentally Friendly: Does not deplete the ozone layer, making it a more sustainable option than its predecessors.
From early 2020 HFCs (including R-404A, R-134a and R-410A) are being superseded: Residential air-conditioning systems and heat pumps are increasingly using R-32. This still has a GWP of more than 600. Progressive devices use refrigerants with almost no climate impact, namely R-290 (propane), R-600a (isobutane) or R-1234yf (less flammable, in cars).
R22 Harmful if swallowed R23 Toxic by inhalation R24 Toxic in contact with skin R25 Toxic if swallowed R26 Very toxic by inhalation R27 Very toxic in contact with skin R28 Very toxic if swallowed R29 Contact with water liberates toxic gas. R30 Can become highly flammable in use R31 Contact with acids liberates toxic gas R32
Hydrocarbon refrigerants (a propane/isobutane blend) were also used extensively in mobile air conditioning systems in Australia, the US and many other countries, as they had excellent thermodynamic properties and performed particularly well in high ambient temperatures.
Short title: Refrigerants Prices w CHARTS Wikipedia 2013-05-10_09.xlsx; Author: 265077: Date and time of digitizing: 07:37, 10 May 2013: Software used: PScript5.dll Version 5.2.2
Pentafluoroethane is a common replacement for various chlorofluorocarbons (i.e Freon) in new refrigerant systems, especially for air-conditioning. The zeotropic mix of difluoromethane with pentafluoroethane ( R-125 ) and tetrafluoroethane ( R-134a ) is known as R-407A through R-407F depending on the composition.
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